520 Reviews — Recent and Fossil Entomostraca. 



actions of the Zoological Society, in the Annals of Natural History, 

 in the Transactions of the Nat. His. Soc. of Northumberland and 

 Durham, in " Les Fonds de la Mer " (an excellent periodical 

 published by some naturalists at Bordeaux), and in some of the 

 popular scientific journals of the day, many well-considered memoirs 

 written by him are to be found, illustrating very many recent and a 

 few fossil Entomostraca. 



The monograj^h before us puts the British genera and species of 

 Ostracoda into order, with full delineations of their valves, limbs, 

 appendages, and other characteristic features. A table (at p. 478 

 and 479) gives the distribution of the British Marine species, show- 

 ing which affect shallow water, and which live in the deep ; also 

 which are found on the Norway Coasts, and which occur in the 

 Post-tertiary deposits of England, Ireland, Scotland, and Norway. 

 Of the 111 species of marine Ostracoda found living in the British 

 Islands, fifty occur in the Post-tertiary deposits, and five have been 

 found in the Tertiary strata of England and Europe. 



The following British living species have been found in deposits 

 of Tertiary age : — 



Cythere punctata, Miinster { = convexa, Baird). Suffolk Crag; Upper and Middle 

 Tertiaries of Germany. 



Jonesii, Baird {=ceratoptera,'Bosqu.et). Suffolk Crag; Upper and Middle 



Eoeene of Belgium and France. 



papulosa, Bosquet. Miocene and Eocene of Belgium and France. 



Ilyobates Bartonensis, Jones. Middle Eocene, Barton, Hants. 

 Loxoconcha tamarindus, Jones. Crag of Suffolk. 



The following recent British Ostracoda, of fresh-water habits, are 

 found fossil in the Post-Tertiary deposits of England : — 



Candona compressa, Koch { = Cypris setiyera, Jones). 

 Cypris yibba, Eandohr. 



reptans, Baird. 



Icevis, Miiller (given as G. ovum in Jones's Monog. Tert. Entom.). 



Candona Candida, Miiller. 



Doubtless this list will be increased by further research. 



The collector of fossil Ostracoda will still find it very difficult to 

 allocate his specimens to their right groups — especially as some of 

 the valves that have hitherto passed as belonging to Cythere may really 

 belong to Bijtlio cythere, Cytherura, or Cytheropteron ; and those valves 

 formerly grouped under Cytherideis may be Eucythere, Ihjohates, Xes- 

 toleberis, Fseudocy there, Schlerochilus, Paradoxstoma, Paracypris, or 

 Pontocypris ! So little could slight differences of valve-structure be 

 regarded of generic value, until they were known to be backed up 

 with differentiation of limbs and other organs. With a better ac- 

 quaintance of recent forms, the observer has now a better chance of 

 assorting his fossil specimens, if well preserved, but he must not be 

 hasty, nor even too confident. 



In illustration of the difficulty the Ostracodist has in his researches, 

 the reader may try to follow Messrs. Jones and Holl in their deter- 

 mination of the several bivalved carapaces they have found in the 

 Lower Silurian Limestone of Kildare. Little but the shapes remain 

 to guide them ; and those present but such slight modifications, com- 



